Weerakoon, H.L.A.; Jayawardhana, K.J.U.M.; Piyasena, K.N.T.; Hewaarachchi, A.P.
(Faculty of Commerce and Management Studies, University of Kelaniya, 2021)
The producer price index (PPI) is a group of indices that represents the average movement in selling prices from domestic production over time. PPI covers major sectors of a country’s economy, and it is used as an objective ...